Secondary Battery Depressed Step Anchoring
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Solution Overview
Problem
Conventional pouch-shaped secondary batteries with V-form regions in the battery case are prone to short circuits when subjected to external forces, as the electrode assembly moves and contacts internal components, leading to safety issues such as explosions or fires.
Innovation Solution
Modifying the receiving part of the battery case with depressed steps at the electrode taps-electrode lead coupling regions to securely anchor the electrode assembly, preventing movement and contact between cathodes and anodes, thereby enhancing safety and utilizing non-functional V-form regions effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the battery case is made with a simple receiving part structure, then manufacturing cost is reduced and ease of manufacture is improved, but the electrode assembly can move under external forces causing short circuits and safety issues
Solution Approach 1:
The battery case receives the electrode assembly with localized depressed steps at specific positions (first depressed step at the upper end, second depressed step at the lower end) rather than a uniformly complex structure. This local modification provides anchoring function exactly where needed while keeping the rest of the case structure simple and easy to manufacture.
Solution Approach 2:
The depressed steps are pre-formed in the battery case during manufacturing before the electrode assembly is installed. This preliminary action ensures that the anchoring structure is already in place to prevent movement, eliminating the need for additional complex fastening mechanisms and maintaining manufacturing simplicity while ensuring safety.
2Reliability
If the battery case includes complex anchoring structures to prevent electrode assembly movement, then safety is improved, but manufacturing complexity and cost increase
Solution Approach 1:
Instead of making the entire battery case structure complex, the invention applies localized depressed steps only at specific critical positions (upper end and lower end of the receiving part). This provides the necessary anchoring function with minimal structural modification, avoiding overall device complexity while ensuring safety.
Solution Approach 2:
The anchoring function is segmented into discrete depressed steps at specific locations rather than using a continuous complex structure. The first depressed step at the upper end and the second depressed step at the lower end work independently to constrain electrode assembly movement, simplifying the overall design while maintaining effectiveness.
3Ease of operation
If the electrode assembly is allowed to move freely in the battery case, then ease of assembly is improved, but short circuits occur under external forces leading to safety hazards
Solution Approach 1:
The depressed steps are pre-formed in the battery case to create natural anchoring zones before assembly. During assembly, the electrode assembly simply needs to be placed into the case where it will naturally settle into the depressed steps, providing both ease of assembly and movement prevention without requiring complex alignment procedures.
Solution Approach 2:
The depressed steps create localized zones of increased depth at critical positions (upper and lower ends) that provide anchoring function exactly where the electrode assembly is most vulnerable to movement. The rest of the receiving part remains at normal depth, allowing free positioning during assembly while preventing harmful movement during operation.
Data Source
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AI summary
Disclosed herein is a secondary battery having an electrode assembly received in a receiving part of a battery case, the electrode assembly being constructed in a structure in which pluralities of cathodes and anodes are stacked one on another while separators are disposed between the respective cathodes and anodes, and electrode taps extending from the stacked cathodes and anodes are coupled to electrode leads, wherein the receiving part of the battery case is provided at the outer upper end thereof with a depressed step such that at least a portion of the inner upper end of the receiving part of the battery case excluding the electrode taps-electrode lead coupling parts of the electrode assembly is in tight contact with the upper end of the electrode assembly.